The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 30, 1990
Filed:
Aug. 31, 1988
Louis M Holleran, Big Flats, NY (US);
John F MacDowell, Painted Post, NY (US);
Francis W Martin, Painted Post, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
This invention relates to the production of glass-ceramic materials particularly suitable for use as substrates in integrated circuit packaging. The inventive glass-ceramics can be prepared from thermally crystallizable glass capable of being concurrently sintered and crystallized in situ at temperatures between about 850.degree.-1000.degree. C. to bodies exhibiting dielectric constants less than about 6, linear coefficients of thermal expansion between about 12-60.times.10.sup.-7 /.degree.C. and containing cordierite solid solution as essentially the sole crystal phase. The glass-ceramics are essentially free from Li.sub.2 O and Na.sub.2 O and consist essentially, expressed in terms of weight percent on the oxide basis of 10-25% MgO+ZnO consisting of 2-18% MgO+0-21% ZnO, 20-38% Al.sub.2 O.sub.3, 40-52% SiO.sub.2, and 2-15% total of at least one oxide in the indicated proportion selected from the group consisting of up to 8% of an alkali metal oxide selected from the group consisting of K.sub.2 O, Rb.sub.2 O, and Cs.sub.2 O, up to 10% of a divalent metal oxide selected from the group consisting of CaO, SrO, BaO, and PbO, and up to 5% B.sub. 2 O.sub.3.